docs: def _font_name(self, ufo):
          """Generate a postscript-style font name."""
          family_name = (
              ufo.info.familyName.replace(" ", "")
              if ufo.info.familyName is not None
              else "None"
          )
          style_name = (
              ufo.info.styleName.replace(" ", "")
              if ufo.info.styleName is not None
              else "None"
          )
          return "{}-{}".format(family_name, style_name)